clearer exception message when using index or index_col in read_csv (d…

…ask#4651)
mrocklin · Mar 29, 2019 · c7d6024 · c7d6024
1 parent 7782cc4
commit c7d6024
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/dask/dataframe/io/csv.py b/dask/dataframe/io/csv.py
@@ -289,8 +289,8 @@ def read_pandas(reader, urlpath, blocksize=AUTO_BLOCKSIZE, collection=True,
     if include_path_column and isinstance(include_path_column, bool):
         include_path_column = 'path'
     if 'index' in kwargs or 'index_col' in kwargs:
-        raise ValueError("Keyword 'index' not supported "
-                         "dd.{0}(...).set_index('my-index') "
+        raise ValueError("Keywords 'index' and 'index_col' not supported. "
+                         "Use dd.{0}(...).set_index('my-index') "
                          "instead".format(reader_name))
     for kw in ['iterator', 'chunksize']:
         if kw in kwargs: